Make highlighted entities clickable in visualization

[UditDewan]

Description

Clicking a highlighted entity in the HTML visualization now jumps the selector to that extraction — updating the attributes panel, progress slider, entity counter, and position info. This makes reviewing extractions on longer documents much faster than stepping through them one at a time with Previous/Next.

Implements the suggestion from the linked issue:

• Added cursor: pointer to .lx-highlight so highlights signal they are clickable.
• Added a delegated click listener on the text window that resolves the clicked .lx-highlight span (via closest(), so nested spans work) and calls the existing jumpToExtraction().

Fixes #103

Feature

How Has This Been Tested?

Added test_visualize_highlights_are_clickable to tests/visualization_test.py verifying the generated HTML wires up the click handler and pointer cursor.

$ python -m pytest tests/visualization_test.py
6 passed

Also exercised the generated HTML in a DOM environment (jsdom): clicking a highlight selects that entity (attributes panel, slider, entity counter, and position info all update, and the lx-current-highlight marker moves), clicking the first entity (data-idx="0") works, and clicks on non-highlighted text are a no-op. Play/Previous/Next behavior is unchanged.

Checklist:

• I have read and acknowledged Google's Open Source
  Code of conduct.
• I have read the
  Contributing
  page, and I either signed the Google
  Individual CLA
  or am covered by my company's
  Corporate CLA.
• I have discussed my proposed solution with code owners in the linked
  issue(s) and we have agreed upon the general approach.
• I have made any needed documentation changes, or noted in the linked
  issue(s) that documentation elsewhere needs updating.
• I have added tests, or I have ensured existing tests cover the changes
• I have followed
  Google's Python Style Guide
  and ran pylint over the affected code.

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